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