(i) 1 + 7 +13 + 19 + ..... to 40 terms.
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Answer:
a = 1
d = 6
n= 40
40th term = 1 + (40 - 1) 6
= 235
total sum = n/2( a + 40th term)
=40/2(1 + 235)
=20 × 236
=4720 Ans...
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