Question

Find the sum of 5+8+...to 10 terms

Answer 1

Step-by-step explanation:

a=5

d=a2-a1

d= 8-5=3

n=10

a/q

sum of n term = n/2{2a+(n-1)d}

= 10/2{2×5+(10-1)3}

= 5{10+(9)3}

= 5(10+27)

= 5×37

= 185

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