If the Ratio of Long and Short Spans of a Two

Multiple Choice

If the ratio of long and short spans of a two way slab with corners held down is r, the actual reduction of B.M. is given by

A) (5/6) (r/1 + r²) M
B) (5/6) (r²/1 + r²) M
C) (5/6) (r²/1 + r3) M
D) (5/6) (r²/1 + r4) M