3,7,11,....up to 40 terms
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Answer:
As first term (a) = 3
Common difference (d) = 7-3 = 4
Number of terms(n) = 10
aSum = n/2[2a + (n-1)d]
Subsitute the values
aSum = 10/2[2x3 + (10-1)4]
= 5(6 + 36)
= 5x42
= 210
Step-by-step explanation:
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