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Answer:
The pattern will be an=a1 × r^(n-1)
Forexample :
a2 =a1×r2-1 =a1×r1 =5×71 =35
a3 =a1×r3-1 =a1×r2 =5×72 =245
a4 =a1×r4-1 =a1×r3 =5×73 =1715
a5 =a1×r5-1 =a1×r4 =5×74 =12005
a6 =a1×r6-1 =a1×r5 =5×75 =84035
a7 =a1×r7-1 =a1×r6 =5×76 =588245
a8 =a1×r8-1 =a1×r7 =5×77 =4117715