1.

The sum of the series 3 1/2 +7 + 10 1/2 + 14 + .... to 17 terms is​

Answer»

Answer:

51

Step-by-step EXPLANATION:

a=t1=3.5

d=3.5

Sn=n/2[2A+(n-1) d]

S17= 17/2 [ 2×3.5 + (17-1)3.5]

= 8.5 [7 + 16×3.5]

= 8.5 [7 + 56]

= 8.5 ×63

= 51



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