Перейдемо до функції надійності:
В
h (r) = r1r2r3r4r5 +
r1r2r3r4r10 (1-r5) +
r1r2r3r4r15 (1-r5) (1-r10) +
r1r2r3r9r5 (1-r4) (1-r10) (1-r15) +
r1r2r3r9r10 (1-r4r5) (1-r15) +
r1r2r3r9r15 (1-r4r5) (1-r10) +
r1r2r8r4r5 (1-r3) (1-r10) (1-r15) (1-r9) +
r1r2r8r4r10 (1-r3r5) (1-r15) (1-r9) +
r1r2r8r4r15 (1-r3r5) (1-r10) (1-r9) +
r1r2r8r9r5 (1-r3r4) (1-r10) (1-r15) +
r1r2r8r9r10 (1-r3r4r5) (1-r15) +
r1r2r8r9r15 (1-r3r4r5) (1-r10) +
r1r2r13r4r5 (1-r3) (1-r10) (1-r15) (1-r9) (1-r8) +
r1r2r13r4r10 (1-r3r5) (1-r15) (1-r9) (1-r8) +
r1r2r13r4r15 (1-r3r5) (1-r10) (1-r9) (1-r8) +
r1r2r13r9r5 (1-r3r4) (1-r10) (1-r15) (1-r8) +
r1r2r13r9r10 (1-r3r4r5) (1-r15) (1-r8) +
r1r2r13r9r15 (1-r3r4r5) (1-r10) (1-r8) +
r6r7r18r19r20 (1-r1r2r3r4r5) (1-r10) (1-r15) (1-r9) (1-r8) (1-r13) +
r6r7r18r14r20 (1-r1r2r3r4r5) (1-r10) (1-r15) (1-r9) (1-r8) (1-r13) (1-r19) +
r6r12r18r19r20 (1-r1r2r3r4r5) (1-r10) (1-r15) (1-r9) (1-r8) (1-r13) (1-r7) (1 - r14) + r6r12r18r14r20 (1-r1r2r3r4r5) (1-r10) (1-r15) (1-r9) (1-r8) (1-r13) (1-r7r19) + r11r17r18r19r20 (1-r1r2r3r4r5) (1-r10 ) (1-r15) (1-r9) (1-r8) (1-r13) (1-r6r7) (1-r14) (1-r12) + r11r17r18r14r20 (1-r1r2r3r4r5) (1-r10) (1 -r15) (1-r9) (1-r8) (1-r13) (1-r6r7r19) (1-r12) + r16r17r18r19r20 (1-r1r2r3r4r5) (1-r10) (1-r15) (1-r9) (1-r8) (1-r13) (1-r6r7) (1-r14) (1-r12) (1-r11) + r16r17r18r14r20 (1-r1r2r3r4r5) (1-r10) (1-r15) (1 - r9) (1-r8) (1-r13) (1-r6r7r19) (1-r12) (1-r11)
В
Якщо ri = r для всіх i від 1 до 20, то після перетворень функція буде виглядати наступним чином:
В
h (r) = r5 +
r5 (1-r) +
r5 (1-r) (1-r) +
r5 (1-r) (1-r) (1-r) +
r5 (1-r2) (1-r) +
r5 (1-r2) (1-r) +
r5 (1-r) (1-r) (1-r) (1-r) +
r5 (1-r2) (1-r) (1-r) +
r5 (...
