A, B, C
AND O
ARE FOUR NUMBERS IN ARITHMETIC
PROGRESSION. THE MEAN OF THESE FOUR NUMBERS IS 20.
THE COMMON DIFFERENCE BETWEEN THE NUMBERS is 5.
FIND THE PRODUCT OF FIRST AND LAST NUMBERS ?
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Step-by-step explanation:
AP
Common difference is 5
Mean of 4 numbers is 20
Let four numbers be
X X+ 5 X+10 X+15
Sum of 4 numbers = 4X+30
Mean of 4 numbers =( 4X+30 )/4
Given mean of 4 numbers is 20
Hence 4X+30 =4×20
4X = 80-30=50
X=50/4=12.5
Product of last and first numbers is X × X+15
=12.5 ×(15+12.5)
12.5 × 27.5 =343.75
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