a meeting hall has 20 seats in the First row 24 seats in the second raw 28 states in the third Rock and so on and has in all 30 Raj how many seats are there in the meeting hall
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Answer:
Step-by-step explanation:
Since given the number of rows are given 30
n=30 and
AP:20,24,28,...................
a=20(first term)
d=4(common difference)
n=30(number of terms)
Therefore no of seats=sum of the AP.
Sum=n/2[2a+(n-1)d]
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Girishwarle:
slove this formula
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