The product of sucessor and predecessor of 99 is
9800
9900
1099
9700
Let's find the product of sucessor and predecessor of 99.
The sucessor of 99 is 100 and the predecessor is 98
Their product = 100×98=9800
Hence, option (A) is correct.
The product of predecessor and successor of 99 is:
The product of successor and predecessor of 999 is: