Step-by-step explanation:
First term =a=7
Difference between terms=d=7
Number of terms =n=40
Sum=S=
2
n
(2a+(n−1)d))
S=
40
(2×7+(40−1)7))
S=20×(2×7+(39)7))
S=20×(14+273)
S=20×287
S=5740
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Verified answer
Step-by-step explanation:
First term =a=7
Difference between terms=d=7
Number of terms =n=40
Sum=S=
2
n
(2a+(n−1)d))
S=
2
40
(2×7+(40−1)7))
S=20×(2×7+(39)7))
S=20×(14+273)
S=20×287
S=5740
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